package com.zxq.matchingSystem.service.impl.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.locks.ReentrantLock;
@Component
public class MatchingPool extends Thread{
    private static List<Player> players =new ArrayList<>();
    private ReentrantLock lock=new ReentrantLock();

    private final static String startGameUrl="http://127.0.0.1:3000/pk/start/game";

    private static RestTemplate restTemplate;

    @Autowired
    public void setRestTemplate(RestTemplate restTemplate){
        MatchingPool.restTemplate=restTemplate;
    }

    public void addPlayer(Integer userId, Integer rating,Integer botId) {
        lock.lock();
        try {
            boolean playerExists = players.stream().anyMatch(player -> player.getUserId().equals(userId));
            if (!playerExists) {
                players.add(new Player(userId, rating,botId, 0));
            }
        } finally {
            lock.unlock();
        }
    }


    public void removePlayer(Integer userId){
        lock.lock();
        try {
            List<Player> newPlayers = new ArrayList<>();
            for (Player player: players) {
                if (!player.getUserId().equals(userId)) {
                    newPlayers.add(player);
                }
            }
            players = newPlayers;

        } finally {
            lock.unlock();
        }
    }

    private void increaseWaitingTime(){
        for(Player player:players){
            player.setWaitingTime(player.getWaitingTime()+1);
        }
    }

    private void matchPlayer(){
        System.out.println("match players "+players.toString());
        boolean[] used=new boolean[players.size()];
        for(int i=0;i<players.size();i++){
            if(used[i]) continue;
            for(int j=i+1;j<players.size();j++){
                if(used[j]) continue;
                Player a=players.get(i),b=players.get(j);
                if(checkMatched(a,b)){
                    used[i]=used[j]=true;
                    sendResult(a,b);
                    break;
                }
            }
        }

        List<Player> newPlayers = new ArrayList<>();
        for (int i = 0; i < players.size(); i ++ ) {
            if (!used[i]) {
                newPlayers.add(players.get(i));
            }
        }
        players = newPlayers;


    }

    private boolean checkMatched(Player a,Player b){
        int scoreDifference=Math.abs(a.getRating()-b.getRating());
        int waitingTime= Math.min(a.getWaitingTime(),b.getWaitingTime());
        return scoreDifference<=waitingTime*10;
    }

    private void sendResult(Player a,Player b){
        MultiValueMap<String,String> data=new LinkedMultiValueMap<>();
        data.add("a_id",a.getUserId().toString());
        data.add("a_bot_id",a.getBotId().toString());
        data.add("b_id",b.getUserId().toString());
        data.add("b_bot_id",b.getBotId().toString());
        restTemplate.postForObject(startGameUrl,data,String.class);
    }

    @Override
    public void run() {
        while (true){
            try {
                Thread.sleep(1000);
                lock.lock();
                try {
                    increaseWaitingTime();
                    matchPlayer();
                } finally {
                    lock.unlock();
                }
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }
}
